Improving discharge characteristics of indirect integral collector storage systems with multielement storage

Adam M Boies, K. O. Homan

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The desired performance of unpressurized integral collector storage systems hinges on the appropriate selection of storage volume and the immersed heat exchanger. This paper presents analytical results expressing the relation between storage volume, number of heat exchanger transfer units, and temperature-limited performance. For a system composed of a single storage element, the limiting behavior of a perfectly stratified storage element is shown to be superior to a fully mixed storage element, consistent with a more general analysis of thermal storage. Since, however, only the fully mixed limit is readilyobtainable in a physical system, the present paper also examines a division of the storage volume into separate compartments. This multielement storage system shows significantly improved discharge characteristics as a result of improved elemental area utilization andtemperature variation between elements, comparable in many cases to a single perfectly stratified storage element. In addition, the multielement system shows increased robustness with respect to variations in heat exchanger effectiveness and initial storage temperature.

Original languageEnglish (US)
Pages (from-to)210031-210039
Number of pages9
JournalJournal of Solar Energy Engineering, Transactions of the ASME
Volume130
Issue number2
DOIs
StatePublished - May 1 2008

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